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EPA's rules for "Review of Indirect Sources", published in the Federal Register recently, make it mandatory that all proposed facilities that will attract substantial numbers of automobiles and thus indirectly pollute the air, must be reviewed. This article discusses the types of facilities that will come under scrutiny, and the factors, such as location and number of users that will be important. Types of chemical pollutants and delegation of responsibility are also discussed. Other forms of control of indirect sources are included; strict control in the design of new towns, methods of providing smooth traffic flow from congested areas and alternate forms of transit.